If all you have is regular blades then I wouldn't bother making smaller ones and just use them as they are like others have said. We've always used them for all print sizes but a good general rule of thumb is to use a squeegee blade that is relative to the print size if you have the ability to do so. I wish we had 40 blade holders and a set of blades of 16", 12", 8" and 4" because according to some gurus, it does make a difference. I've seen it personally a few times recently with some of the testing we've been doing on one hit prints. But 99% of what we all do doesn't require us to be that detailed with our setups, thank goodness.